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#1
06-24-2009, 09:16 PM
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Diesel Shutoff Solenoid Leaks? 93 300D 2.5L
Lately my w124 300D 2.5L has been shutting down slower and slower. Once I turn the key to off it takes 1 to 2 seconds for the engine to slow down and stop.
My first thought was that the shutoff actuator is going bad. The first step I did was to remove the brown vacuum line from the actuator and the other end from the brake booster line. When I plug up the end to the actuator and use my MityVac on the other the line holds vacuum great with no bleed down. I believe this means the circuit from the brake booster line to the actuator is tight. When I put the MityVac directly to the shut off actuator I can pump and pump the MityVac and the shutoff lever just moves down a bit and comes right back up to the no vacuum position. When I push the shutoff lever to OFF and plug the shutoff actuator outlet the lever will slowly move up to the ON position. I assume the actuator should hold a vacuum, correct? This must mean I have a leak in my actuator diaphragm. I’ve seen the DieselGiant page about changing the actuator on what I think is a 123. Is there a good description somewhere about changing it on a 124? I understand that if you put it in backwards you can mess up the engine. This thread describes pretty well the physical location of the actuator. '92 2.5 Turbo: Replacing Vacuum Valve on Injector Pump Thanks-Brad
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png Last edited by Oldwolf; 06-26-2009 at 10:58 AM. Reason: Corrected the part name in the title 
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#2
06-24-2009, 09:53 PM
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I just saw that the new style shutoff actuator is made of plastic. Should I look around for a metal one?
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png
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#3
06-24-2009, 11:58 PM
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OM 602 Vacuum ShutOff Valve R+R
Member PDrayton has your ILLUSTRATED (With clear,sharp Pictures)
replacement procedure Here: http://www.peachparts.com/shopforum/showthread.php?t=190780&highlight=vacuum+shut+off+valve 'Not sure about the Plastic VS Metal ,Have to skulk about and see.
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'84 300SD sold 124.128
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#4
06-25-2009, 09:26 AM
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That's great to have...thanks! I looked around the forum but I guess I didn't use the correct search criteria.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png
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#5
06-25-2009, 03:48 PM
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Mine did the same thing. Turned out to be the ignition vac switch..Pretty common on the late w124's. Shuts off perfect now!
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1984 190d 2.2 Greasecar Kit. Running Wvo for 25K 1993 300D 2.5T Black on Black. Soon to be Greasy!
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#6
06-26-2009, 10:57 AM
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For the record, Google this part number to get information on the shutoff valve that fits our 602's. Just using the part number yield a lot of pertinent hits.
Diesel Shutoff Solenoid 0000704653
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png
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#7
06-27-2009, 07:38 PM
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Now my car won't even shut off with the key. To keep oil out of the vacuum system I'm not even trying to use the key anymore. The diaphragm should be here Wednesday.
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1993 W124 300D 2.5L Turbo, OM602.962 2000 Chevrolet Cavalier, 2.4L DOHC 2002 Ford Explorer, 4.0L SOHC 2005 Toyota Prius, 1.5L http://www.fuelly.com/sig-us/40601.png
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